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Theory: biros have unlimited ink
(self.ukcasual)
A friendly place to chat.
No politics please. Don't be a dick.
Years ago (the early 70's), my auntie worked in an office whereby she could only get a new Biro from the cupboard if you brought back the empty one!
There's a scene in Mindhunter showing BTK enforced a similar policy at work, so maybe your auntie had a lucky escape.